<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <!-- tab标签栏 -->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称：" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格：" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量：" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量：" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类：" prop="goods_cat">
              <!-- 级联选择框 -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="{
                  expandTrigger: 'hover',
                  value: 'cat_id',
                  label: 'cat_name'
                }"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item
              v-for="item in manyTableData"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <!-- 参数复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传的后台api地址
            on-preview预览处理
            file-list指定预览方式
             -->
            <el-upload
              :action="uploadUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑区 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="addBtn" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="30%"
      >
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      //当前进度索引
      activeIndex: "0",
      //添加商品表单对象
      addForm: {
        goods_name: '',
        goods_price: '0',
        goods_weight: '0',
        goods_number: '0',
        //选中商品分类id数组
        goods_cat: [],
        //上传的图片数组
        pics: [],
        //商品详情
        goods_introduce: '',
        //将动态参数和静态属性结合起来提交
        attrs: []
      },
      //表单输入验证
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", triggle: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", triggle: "blur" }
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", triggle: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", triggle: "blur" }
        ],
        goods_cat: [
          {
            type: "array",
            required: true,
            message: "请选择商品分类",
            triggle: "change"
          }
        ]
      },
      //商品分类列表
      cateList: [],
      //动态参数列表
      manyTableData: [],
      //静态属性列表
      onlyTableData: [],
      //上传图片的URL地址
      uploadUrl:'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      //预览图片地址
      previewPath:'',
      //图片预览可见
      previewVisible: false,
      
      
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.cateList = res.data;
    },
    //级联选择器选项改变
    handleChange() {
      console.log(this.addForm.goods_cat);
    },
    //标签页改变触发
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类");
        return false;
      }
    },
    //标签页点击
    async tabClicked() {
      
      if (this.activeIndex === "1") {
        //动态参数面板
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" }
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取参数列表失败");
        }
        
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
        });
        
        this.manyTableData = res.data;
      }else if(this.activeIndex === "2") {
        //动态参数面板
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" }
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取属性列表失败");
        }
        
        this.onlyTableData = res.data;
      }
    },
    //预览图片处理函数
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    //处理移除图片的操作
    handleRemove(file) {
      //获取将要删除图片的临时路径，从pics数组中删除
      
      const filePath = file.response.data.tmp_path;
      const index = this.addForm.pics.findIndex(x => x.pic === filePath);
      this.addForm.pics.splice(index,1);
      
    },
    //图片上传成功回调函数
    handleSuccess(response) {
      //拼接得到一个图片信息对象
      const picInfo = {pic: response.data.tmp_path}
      //放到图片数组中
      this.addForm.pics.push(picInfo);
      
    },
    //添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        //执行添加的业务逻辑
        // lodash    cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',');
        
        //处理动态参数
        this.manyTableData.forEach(item => {
          
          const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')};
          this.addForm.attrs.push(newInfo);
        })
        //处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals};
          this.addForm.attrs.push(newInfo);
        })
        form.attrs = this.addForm.attrs;
        //发起请求,商品的名称必须是唯一的
        const {data:res} = await this.$http.post('goods',form);
        if(res.meta.status !== 201){
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功');
        this.$router.push('/goods');

      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  }
};
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.addBtn {
  margin-top: 15px;
}
</style>